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We carried out a vibration study experiment on a masonry building in the town of Ariano Irpino,southern Italy, using six-channel stations equipped with three-component velocity-transducers andaccelerometers and running in continuous modality from January 2006 to December 2007. Theanalysis of weak motions from several local earthquakes, together with the 3D numerical modellingof the structure, allowed us to identify the first three vibration modes of the target building.Therefore, we checked the validity of ambient noise data to determine the vibration frequencies ofbuildings.The analysis tools based on earthquake and ambient noise data were conventional, i.e. spectralratios between homologous components of stations at high floors in the building with respect to astation installed at the basement, and single-station spectral ratios between horizontal and verticalcomponents.The indications derived from earthquakes and ambient noise result in a satisfactory agreement forfrequencies between 1 and 20 Hz when using recordings characterized by low levels of amplitude,both for cultural and meteorological noise. In contrast, when the wind speed increases (above 20km/h, approximately) seismic noise shows an excess of horizontal vibrations at low frequencies(below 2 Hz). These extra-amplitudes are not related to the seismic input vertically incident to thebasement, but are probably due to the lateral action of the wind on the building. In contrast anthropic activitiesdo not affect considerably the trend of spectral ratios in the range of frequencies that includethe first modes of vibration of the building, even at high noise level

A study of building vibrations induced by weak motions: effects of earthquake excitation, ambient noise and wind speed